I've said it before - we'd be better served by something akin to the Skytrain in Vancouver, which has lines that loop from a central station (and another connecting station on the newest line, aptly named Bridgeport) out to various suburbs, etc.
The downside to this is that we don't all get our own individual lines. The upside is that we don't have said individual lines making an absolute mess of a station with all sorts of things coming out every possible direction.
Bryson already knows the layout I mean, but here's a link for the rest of you. Linky